basic data types in java

Data types in java are two type' s

1. Primitive 
2. Reference

Mostly Used Primitive Data Type' s

1. boolean 
2. char
3. int
4. byte
5. float
6. long
7. double
8. String

Data Type: boolean

Bytes: 1 bit.

Description: this data type represents 1 bit information, mostly used in the true/false conditions.

Possible values: true/false 

Data Type: char

Bytes: 16 bit unicode.

Description: this data type used to store character' s.

Data Type: int 

Bytes: 32 bit signed representation.

Description: this data type used to store integer of signed representation.

Data Type: byte 

Bytes: 8 bit signed representation.

Description: this data type used to store integer of signed representation, this type is useful when we need to store an array of integer's with max of 8 bit' s. so, we can save 24 bit' s when compare to the int data type.

Data Type: float 

Bytes: 32 bit

Description: this data type used to store integer with single-precision/decimal values.

Data Type: long

Bytes: 64 bit signed representation.

Description: this data type used to store integer with single-precision/decimal values.

Data Type: double

Bytes: 64 bit signed representation.

Description: this data type used to store integer with single-precision/decimal values.

Data Type: String

Bytes: 64 bit signed representation.

Description: this data type used to store integer with single-precision/decimal values.

Example code:

package snippets1;

/**

 * Created by root on 11/3/16.

 */

public class DataTypeTest {

    public static void main(String args[]){

        boolean status = true;

        char a = 'A';

        int b = 12;

        byte e = 12;

        float f=3.14f;

        long c = 1235;

        double d = 12345.23;

        String str = "programming";

        System.out.println("boolean: "+status+"\nchar: "+a+"int: "+b+"\nbyte: "+e+"\nfloat: "+f+"\nlong: "+c+"\ndouble: "+d);

    }

}

Command line example in java

Passing command line arguments in java

1. check the number argument's passed, exit the program with status success when you received insufficient command line arguments.

        if(args.length==0){

            System.out.println("Insufficient Arguments..");

            System.exit(0);

        }

2.  Parse the arguments to Integer from String.

      System.out.print("sum="+Integer.parseInt(arg1)+Integer.parseInt(arg2));

for complete code click here.